Active residues
Biomass Auxiliary flocculent materials
- Concentrates
- Slurry residues
- Combined waste water
- Compacted residues
- Conditioned residues
- Raw waste residues
Dehydrated residues
- Digested residues
- Excess residues
- Fecal substances
- Ferric chloride
Floating residues
- Fresh residues
- Oil & grease emulsions
- Raw gypsum suspension
- Hygiene residues
- Industrial residues
- Leaching water
Slaked lime
- Liquid excretion
- Lubricant
- Metallic hydroxide residues
- Turf residues
- Polymers
- Polymer solution
- Primary residues
- Refined residues
- Recirculation residues
- Fluvial residues
- Secondary residues
- Waste residues
- Stabilized residues
- Excess activated residues
Viscous residues
Thin residues
- Sewage water
Your medium... our product, from thin to viscous
Viscous Residues
A first reduction of residues is obtained through mechanical or static thickening methods. The goal is to obtain a dry solids residue from 6% to 11% in the pumped fluid.
Depending on the consistency, the fluids will have a low to high viscosity and can be pumped through long distances.
The multiple-stage NEMO® Progressive Cavity Pumps are capable of pumping under high pressure conditions. Even fluctuating processing conditions are handled effortlessly.
Floating Residues
Floating residues and residue foam are fractions of floating residues that accumulate on the surface of the secondary sedimentation tank.
This undesirable effect will require the pumping of floating residues as a fluid/air mixture.
The ideal device for this application is the NEMO® progressive cavity pump which is capable of transporting, reliably and continuously, the fluids that contain a high gas content.
Thin Residues
These are the most common residues in a waste treatment plant. The content of dry solid residues is approximately 1% to 4%. According to the process stage, the residues may contain varied quantities of solid organic and inorganic residues.
Depending on the process, pumps with a higher service life that deliver high low-pressure flow rates will be necessary.
The NEMO® Progressive Cavity pump excels mainly because its high performance based on L or P geometries. Another advantage is its long service life due to a wide sealing and a low displacement speed of the rotor.
Dehydrated Residues
The dehydration of residues by addition of conditioning additives in centrifuges, decanters or press filters generates a higher volume reduction between 65% and 80%. The result is a clumpy, compact and drainage-free product.
Due to these features, a forced feed of the fluid in the pump becomes necessary. Aside from that, the accumulation of residues should be avoided.
The NEMO® Progressive Cavity Pumps with rectangular hoppers and feeding taps are generally used for this application. The special features of these pumps are their patented, optimally positioned taps for an optimized transfer to the transport chambers. For slurries with a build-up tendency, The NEMO® Progressive Cavity Pump is equipped with an integrated buildup breaker.
Biomass
The biomass is a renewable raw material that represents a source for the future. The non-homogenous, organic substance occurs in any material from liquid to solid. Gaseous methane and carbon dioxide are regenerated with the aid of microorganisms.
The biomass has to be constantly stirred in the reactor depending on the process. In this case it will be necessary to use pump systems capable of dealing easily with high flow rates and large particle sizes contained in the dry solid residues.
Slaked Lime
Slaked lime is an inorganic suspension of calcium hydroxide and water. As an alternative, slaked lime can be produced by dissolving dehydrated lime in water. Slaked lime is used as a conditioning substance to dehydrate slurries.
The geometry and structure of calcium hydroxide (lime) depend on its origin and processing method. This medium is very abrasive.
In order to ensure a long service life, NEMO® Progressive Cavity Pumps are executed with high-quality rotor/stator materials. The most adequate is the wear-free NEMO CERATEC® ceramic rotor, coupled with an extremely wear-resistant polyurethane stator.
Auxiliary Flocculent Materials
Auxiliary flocculent materialsFlocculent materials are added to the residues before dehydration. They stimulate the formation of large suspended solid chunks in the residues, thus contributing for better dehydration results.
Generally, flocculent materials are dosed as polymer solutions or dispersions.
Their viscosity, along with the need of a precise dosing, requires pumps with certain resources, only offered by NEMO® Progressive Cavity Pumps.